storm sash vs storm window

storm sash and storm window both are nouns.

Word	Noun	Adjective	Verb	Adverb
storm sash	Yes	No	No	No
storm window	Yes	No	No	No

As nouns, storm sash and storm window are synonyms defined as:

storm sash and storm window: a window outside an ordinary window to protect against severe weather or winter

storm sash (noun)	storm window (noun)
a window outside an ordinary window to protect against severe weather or winter	a window outside an ordinary window to protect against severe weather or winter